Bell and spigot asphalt steel core pipe



Sept. 22, 1942. J. K. M KINNON BELL AND SPIGOT ASPHALT STEEL CORE PI IPE Filed March 19, 1941 v jwuc/nw J K Ila 50277212012 Patented Sept- 22,.

.UNITMED i STATE This invention relates to pipes for conveying water, sewerage, or other fluids, and the principal' object is to provide such pipe of an infproved structure by which the necessary strength 2,296,580 am am) srroo'r asrmwr swam. com:

John K. MaoKinnon, Mount Pleasant; 'rcz, as-

signor to Take Asphalt & Refining Company,

Mount Pleasant, 'lex Application March 19,1941, Serial No. 384.11% 5 mm (c1. ran-as) s PATENT oFi-lcsY provided with a plurality of circumferentiallyspaced detents 4 while the spigot end is provided with'a plurality of similarly disposed projections 3, these projections on the respective is provided by a metallic element which in .turn 5 ends being spaced axially with. respect to the is protected both from the contents of the-pipe and from weather conditions exterior of the pipe from corrosion.

A further" object of the invention is to provides composite metal asphaltic pipe with improvedmeans ior associating sections by means of which said sections are mechanically interlocked and the asphaltum layers formed into continuous asphaltu-m sections completely prolocking joint when the respective ends so that they-constitute an interspigot Joint of one section is inserted in the bell end ofanother and rotated slightly therein. "section is further provided with an orifice 8 through which the sealing asphaltum may be poured, as hereafter described.

The asphaltum contemplated in connection with this invention would be of a consistency The bell end of each tecting the metallic element from contact with substantially solid but not brittle at normal temin connection with the scription.

The invention consists in the novel construction, arrangement, and combination of parts and the methods hereinafter more and claimed.

One sheet of drawings accompanies this specification as part thereof in which like reference characters indicate like parts throughout;

After the pipe sections are assembled as indiill appear more clearly 2 cated in Figure 2 molten asphaltum will be poured through the orifice 8 into the channels between the inside of the bell and the outside oi the spigot and it will be noted that this sealing layer I will contact and coalesce with the fully described abutting ends of the inner asphaltum layers 5,

and also'with the abutting ends of the exterior asphaltum layers 8 so that in the resulting joint the mechanical interlocking detents 3 and 4 are sealed by the asphaltum I against rotation Figure 1 is a side elevation of an improved and the inner and outer asphaltum layersJ pipe section partly broken away; Figure 2 is an enlarged fragmentary crosssection through the asso sections preliminary to asphaltum;

ciated ends of two pipe filling the joint with and 8 are formed into continuous homogeneous asphaltum conduits completely surrounding the metallic cores of the assembled pipe sections,

both interiorly and exteriorly. An eiilcient mode of manufacturing these improved pipe sections is illustrated in Figures 5 and 6. in the former of which, is illustrated a conveyor C upon which are positioned a plurality ofhinged molds M and above which con- Figure 5 is a diagrammatical side elevation Q veyor is positioned a container for -molten illustrating the apparatus and process utilized in the manufacture of the improved .pipe; and

Figure 6 is an exploded vertical cross-section through an assembled mold.

asphaltum T; from which a co two valve controlled nozzles which the molds M successively pass. Beyond the nozzles I! a water spray S is positioned by nduit extends to t2-l2, beneath In accordance with the present invention means of which cooling water can be sprayed of asphaltum.

In the preferred form the pipe sections are formed with a bell at one end and a spigot at the other, adapted to be inserted in the bell end of a similar section.

over the molds to cool the asphaltum.

The mold assemblies are illustrated more particularly in Figure 6, in which the mold. is shown open and in which is positioned a tubular core it upon which is seated a paper tube ill and upon the upper end of which is positioned a cap ll, having radially disposed wings I! adapted to position the tubular core l,'whieh is positioned in v the mold with the bell end up. A second paper The bell end of the tubular core member I is tube 8 lspositioned outside of core I and in contact a aseaeeo with the inner sides oi the mold proper. With' gamated with said sections to iorm-a unitary this arrangement it will be noted that aaphaltum structure.

can be poured between the inner paper tube Ill and core i to provide the inner asphaltumlayer which will extend only tojthe bottom edge oi the bell part of the section while asphaltum is similarly deposited between metal core I and outer paper tube 8 to form the outer asphaltum layer which extends from the upper, edge of the 'bell to the inner edge of the spigot, the paper tube 8 preferably having its bottom edge intumed as at H to form a bottom for this lower end.

With the conveyor voperating-to successively 3. A composite pipe pection comprising a metal pipe core formed at one an inwardly directed protuberance and amoriilce in its side wall and at its opposite or spigot end having an outwardly directed protuberance. an

outer pipe section extending fromthe outer end or the bell to a point spaced from the opposite or spigot end, an inner pipe section extending from the outer end 101' the spigot "end to the inner J end of the bell, said inner and outer sections formed 01' an asphaltic material and closely adposition the molds beneath the nozzle l2 the molten asphaltum can be readily deposited to the requisite depths.

Various modifications in the precise construc-' tion, and arrangement ofthe-parts will readily suggest themselves to those but all within the scope oi the present invention as claimed.

It will be understood that the term asphaltum wherever used in this specification, and the appended claims, is intended to include tars and other similar materials. I

Having thus fully described my invention, I claim: Y a

1. Composite pipe comprising a metal pipe core having inner and outer pipe sections of substantial thickness, of non-metallic, non-rigid fusible material adhering to the inner and outer surfaces of the metal pipe to form a unitary structure. said pipe and opposite complementary end portions adapted to co-mate with those of a similar section, with means in one of said end portions for admitting fused non-metallic. non-rigid material into fusing relation with the adjacent end portions of similar material 2. A plurality of pipes as specified aligned longitudinally with parts '01 the adjacent metallic sections in interlocking engagement and theinner and outer sections of adjacent pipes bonded with a similar fusible material amalskilled in the art.

oi the pipe structure."

in claim 1 40 outer pipe parts.

hering to the metal core to ture. I,

4. A plurality of pipe sections as form a unitary strucadiacent bell and spigot ends in alignment to interlock the sections and the spaces between said spigot ends filled with asphaltic material amalgamated with the outer and inner pipe sections to form a unitary pipe.

5. A composite pipe section comprising .a metal pipe core formed at one end with a bell, an outer pipe section extending from the outer end 01 the bell to a point spaced from the opposite or'spigot end, an inner pipe section extending from the outer end of the spigot portion to the inner end of the bell part, said inner formed--01 a fusible non-metallic, non-rigid'materlal. said bell and" spigot portion 01' the metal core part proportioned so that the spigot portion will be spaced from the bell part section when seated therein; with means for mechanically interlocking said parts in such position and-means for introducing in iused liquid form similar material to that forming the inner and outer pipe parts into said space between spigot and bell to fill said space and fuse and amalgamate with the adjacent inner and J-OHN x; MACKINNON.

end with a bell having and outer sections 

